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ALC655, ALC655D, ALC655-LF

Table of contents:
Info of ALC655
Info of ALC655D
Info of ALC655-LF

ALC655, ALC655D, ALC655-LF Selling Leads, Datasheet

MFG:REALTEK Package Cooled:QFP D/C:05+

ALC655, ALC655D, ALC655-LF Datasheet download

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Part Number: ALC655

MFG: REALTEK

Package Cooled: QFP

D/C: 05+

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ALC655 General Description

The ALC655 is a 16-bit, full duplex AC'97 2.3 compatible six channels audio CODEC designed for PC multimedia systems, including host/soft audio and AMR/CNR based designs. The ALC655 incorporates proprietary converter technology to meet performance requirements on PC99/2001 systems. The ALC655 CODEC provides three pairs of stereo outputs with 5-Bit volume controls, a mono output, and multiple stereo and mono inputs, along with flexible mixing, gain and mute functions to provide a complete integrated audio solution for PCs. The digital interface circuitry of the ALC655 CODEC operates from a 3.3V power supply for use in notebook and PC applications. The ALC655 integrates 50mW/20ohm headset audio amplifiers at Front-Out and Surr-Out, built-in 14.318M 24.576MHz PLL and PCBEEP generator, those can save BOM costs. The ALC655 also supports the S/PDIF input and output function, which can offer easy connection of PCs to consumer electronic products, such as AC3 decoder/speaker and mini disk devices. ALC655 supports host/soft audio from Intel ICHx chipsets as well as audio controller based VIA/SIS/ALI/AMD/nVIDIA/ATI chipset. Bundled Windows series drivers (WinXP/ME/2000/98/NT), EAX/ Direct Sound 3D/ I3DL2/ A3D compatible sound effect utilities (supporting Karaoke, 26-kind of environment sound emulation, 10-band equalizer), HRTF 3D positional audio and Sensaura™ 3D (optional) provide an excellent entertainment package and game experience for PC users. Besides, ALC655 includes Realtek's impedance sensing techniques that makes device load on outputs and inputs can be detected.

ALC655 Maximum Ratings

Parameter	Symbol	Minimum	Typical	Maximum	Units
Power Supplies Digital Analog	DVDD AVDD	3.0 3.5	3.3 5.0	3.6 5.5	V V
Operating Ambient Temperature	Ta	0	-	+70	oC
Storage Temperature	Ts			+125	oC
ESD (Electrostatic Discharge)
	Susceptibility Voltage

ALC655 Features

Meets performance requirements for audio on PC99/2001 systems
Meets Microsoft WHQL/WLP 2.0 audio requirements
16-bit Stereo full-duplex CODEC with 48KHz sampling rate
Compliant with AC'97 2.3 specifications
   -Front-Out, Surround-Out, MIC-In and LINEIn Jack Sensing
-14.318MHz- 24.576MHz PLL to save crystal
-12.288MHz BITCLK input can be consumed
   -Integrated PCBEEP generator to save buzzer
   -Interrupt capability
Three analog line-level stereo inputs with 5-bit volume control: LINE_IN, CD, AUX
High quality differential CD input
Two analog line-level mono input: PCBEEP, PHONE-IN
Two software selectable MIC inputs
A dedicated Front-MIC input for front panel applications (software selectable)
Boost preamplifier for MIC input
LINE Input shared with surround output; MIC input shared with Center and LFE output
Both Front-out and Surround-Out built-in 50mW/20Ω amplifier
External Amplifier Power Down (EAPD) capability
Power management and enhanced power saving features
Stereo MIC record for AEC/BF application
Supports Power Off CD function
Adjustable VREFOUT control
Supports double sampling rate (96KHz) of DVD audio playback
Support 48KHz of S/PDIF output is compliant with AC'97 rev2.3 specification
Support 32K/44.1K/48KHz of S/PDIF input
Power support: Digital: 3.3V; Analog: 3.3V/5V
Standard 48-Pin LQFP Package
EAX™ 1.0&2.0 compatible
Direct Sound 3D™ compatible
A3D™ compatible
I3DL2 compatible
HRTF 3D Positional Audio
Sensaura™ 3D Enhancement (optional)
10 Bands of Software EQualizer
Voice Cancellation and Key Shifting in Kara OK mode
AVRack® Media Player
Configuration Panel to improve Experience of User

ALC655 Connection Diagram

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